Compound brake for traction-elevators.



UNITED sTArEsrnENf OFFICE AUGUs'r sUNDH, or YoNKERs, NEW YoRKfAssICNon To o'rrsELEvA'roE COMPANY, -or JERSEY CITY, NEW JERSEY, A CORPORATION oF NEWJERSEX. v

CoMPoUND BRAKE ron TRACTIONELEVATORS.

1,043,741@ f specmeation of Letters Patent. ,Pateted Nfov, 5, 1912,

I Application med :une 24, 1907... serial No. asomo.

l'o all whom it may concern: motor shaft 46, are cables 27 and 28,respec' Beit known that I, AUGUsT SUNDH, a c1t1- tively, which are 'connected by they thimble zen ofthe United States, residing at Yon- 26 to a single cable, 23 which passes around ccr's,in the county of Westchester and State a 'direction pulley 24 mounted on fixed brack- 1j of New York, have invented a ne1 anduseets 25 and up to the top `of the hatchway 60 ful Improvement in Compound Brakes for where it is fastened to one end of a brake Traction-Elevators, of which the followlng lever 7. The other end of this lever is pivis a specification.y oted at.6 to an extension of the sheave bear- My invention relates to compound brakes ing 5, or to any other fixed support. This `l for'elevators and one of its objectsis to .rolever y'i' is part. of a brake device comprising 35 vide simple andetlicient means for bra (lng toggle llinks 11 and 12 which are connected an elevator upon stopping, and it consists'in togethftilo to a link 9 which is connected the novel construction and arrangement of to the brake ylever 7 by a piny 8.' The toggle f parts hereinafter described and specifically links lland 12ers connected to brake shoes v pointed outin the appended claims. v 19 andJQOat 417 'and 18, respectively'. Addi- 70 s The accompanying drawing illustrate" my. tional links" 13 and 14 are attached at "17 invent-ion applied to a direct or traction' and 181to the brake shoes 19 and 20 and are drive elevator system, to which it is particupivoted atl 15 andff'l, respectively, to the I. 'larly well adapted. fixed overhead beams-3 `The brake shoes 19 f hFigure 1 shows one a plication of my inand 20 may be arranged to bear against the 75 vention; Fig. 2 a modi cation thereof; and periphery of the sheaves 4 and 21 as shown, Figs. 3 and 4 are views of details. or to bear directly against thecables 1, in Referring to the drawing, C designatesran which case it would ybe'necessary tosslightly elevator car suspendedfrom an overhead nodifystlre form of the ybrake shoesfor the sheave 21 by means of cables 1 vvliclpss brake shoes\19-- h1fid` 20 may engage both .the 80 down and around a frictiondriving sheave cable'vand the peripheries of the overhead 30, thence up and over a sheave 4 and leadsheaves. See Fig. 4. ing down and connected t'o a'counterbalance The. brake device mounted on they motor weight 2. The driving sheave is mounted shaft 1s apphed by means of a compression 30 to rotate witlrthe'mtor shaft'46apd adaptspring 39 which forces the ma et core 38 85 ed to befrevolv'ed by the mot-or M inxether-sandntpggle links 35k and4 36j ownwardly, direction, according to whether the car is to thereby Iioving the brake levers 33 and 34 be lifted or lowered.l lfreferably the inner outwardlyand thus forcing the brake shoes periphery of the driving sheave `30 is turned 31 and 32 against theinner peripheryofthe 3.5 to a smooth surface atlaptedlto be en aged driving 'sheave 30. In order to 'release the 90 by suitable brake shoes.v The brakenuexyfioe brakeshoesnfrpm the driving sheave, the which operates on this inner periphery comi" YVmagnet co1l-37 1s`7e`nergize'dand vthe magnet prises a frame 47 loosely mounted on the core 38 i'sllfted, overcoming the action of Y motor shaft 46 and has two' outwardly exthe spring39 and cansino the toggle links 35 tending arms 45 and44. The lower part of and 36 to draw the bra (e levers 33 and 34 95 l the frame 47 isprovidedzavith a recessed inwardlyand thereby release the brake shoes f portion adapted to receive a inagnetwwindee-Ylrapd 32 from en agement withthe inner ing .37 and magnet core 38. The lowenend lperipllerysof the riving sheave 30. The ofthe core 38 is connected at 48 to the toggle over ead brake device also is provided with lins 35 and 36 which in turn are connected a compression spring`49, one end ofwhic'h 100 to rake levers 33 and 34, respectively.y The rests on a fixed support or the beam 3;"the ,brake levers are pivoted to thegntwardly other end,'byypressing against an abutment extending arms 45 and/44.at'4() and 41 repiece52 connected to the lpinlO, lifts the'togj spectively, andeaelrbrake lever carrles a le links 11 and 12,there lifting the right- .50 brake shoeffS/md 32P1V0tedt 50 and 5 andend of the brake liever 7 and with- 105 respectively, andifadapted t0 enga e the' drawing thebrake shoes 19 and 20 from their smoot innYr perlphrery of' the. riving respectlve sheaves. The upward. movement sheave 30'. ofthe lever arm 7 islimited by the cables Fastened n the brakeifrnme at 42 and43,- ,23, 27 and 28. The tendency of the spring und Substantially equally distant from .the 39 is to apply the brake shoes 31, 32 `to the 110 ing sheave brake shoes and the hasacted to release the'overhead' brake Vslicesdriving sheave 30, While the tendency of the spring 49 is t-o release the brake shoes 19 and 2O from the sheaves 4 and 21 and those portions of the cables 1 opposite the latter brake shoes.

I will now point outthe operation of the Abrake device just' described. l Assuming-the motor to be revolving in a clockwise direction corresponding to an up- Ward movement of the car and that the inagnet 37 is fully energized to release the drivspring 49 19 and 20, the elevator will run freely. In order to bring the car to rest current is cut ott from the. motor and the brake solenoid 37, and the latter is at oncedenergized and allows the spring 39 to apply the brake shoes v to the driving sheave as before pointed y tends to revolve,V due to put. The ltendency of the driving sheave 30 is to continue to revolve owing .to the Inomentumof the moving parts throughout the system, and the motor brake device also lthe frictional contact ci1 StlI12 beWGD its brake shoes and the dllvmg shew@ 9A). Such being the case, ast-he motor brle device together With the dllVlRg Shae 30 tend to revolve in a COCkWlSe lirection, a downward pull will be exerted upon the right-hand end of brake 16ml 7. through the cables 28 and Q3. vThis dOW'nvvard pull upon the lever 7 'Will be transmitted to the toggle links 11 and 12. thereby overcoming the i th spring 49 and forcing the brake shoes 19 and 20 againstthe respective cable sheaves 4 and 21. The downward riiovenientof the brakeV lever 7 is arrested as soon as the overhead brakes are r'inly applied to their respective sheaves, and the motor' brake device therefore 'prevented fromiurther movement by the cables 23' and 28.1. It is clearly seen that fle comblned retarding ac- In order to releasethe brakes to allow` the elevator to start a circuit is closed to `thc. brake. magnet 37, and the same is energized to Withdraw the brake shoes operated thereby. The motor-brake device is noiv free to move about the shaft 4G and the spring 49 atonce lifts the toggle links 11 and 12,therebv releasing the connected brake shoes from their respective cable sheaves and liftingl the lever This effects an Aup- Ward pull upon the cables Q3 and 28 and the result Will be to restore the motor brake device to its original central position as shown on the drawing. The motor and its connected elevator car and counterweiglit are noiv free to start again to liftpi' lower the car, since both brake devices are released.

Should the brakes be applied to. stop the. elevator when the car is descending, the motor brake device together with the driving sheave() will move in a counter-clockwise direction and a pull Will be exerted upon the cable 27 instead o 't the cable 28 as before described in connection with an ascending elevator car. The subsequent operation upward pressure of of both brakes will be the same as before pointed out and needs no further descrip tion. yThe pressure of the brake shoes 31 and 32- against the inner periphery of the driving sheave 30 may be varied at will by adjusting the tension of the spring and the pleasure ot' the brake shoes 19 and Q0 against the, respective cable sheaves associated therewith may be varied hv adjusting the tension of the spring 49. I sometimes provide a limit stop 53 for the brake lever 7, in which case the overhead brakes and the motor brakes are always applied with uniform strength, and instead of using the cables 27 and 28 the cable 23 may be made 95 long enough to be connected directly. to the brake frame 47 at a point directly in line -With the motor shaftI as shown in Fig. Q so that no matter which Way. the brake frame is revolved about the motor shaft a pull will be exerted upon the cable 23 and so transmitted to` the' overhead brakes. The combined action of the motor and overhead brakes eifectually overcomes any slipping .of the cables on a. traction or direct drive el'eniat'or,` at the ysaine time the uniform and Successive application of both sets of brakes produces a much larger friction capacity7 than if either brake alone acted; also, while r the braking effect is vastly increased no exllc tra tension is placed upon the hoisting cables. Y

It should be particularly noted that braking actioiijn the traction elevator systclil illustrated is distributed, a primary braking action being produced at the driving sheave and a sec'oiidarv braking vaction on lhepvci'- head Shem-@Snd the power transmitting cables. The application Cf 21 l-ll'knfl' m'llm 12, o'n the overhead sheaves and ine "'illllOS 11S' sociated therewith, iii 'co\'c1- Nul-Q l0 tmf vent stretching of the ropes and collla'lllutll tee'tering or jumping of; the par. lt wl also be seen that tendency ol' the cables to w slip en the driving sheaves is counlci'actcd L i by secondari1 brakingaction.

Instead oi a plurality ot'. braking .opcratefl liv a single lever to apply http to 'prrespbndinpj direction sheaves, Mieli.L 23a myy be only one shoe associated Wi i L single pulley. particularly iny elevator systems other l than of the type illustrated. Furthermore, there maybe a plurality of levers like that'designated by the referencenumber 7, each connected `toa brakey fora rote/ting sheave and each operated from thevv primary braking apparatus which isv pifvoted as a whole loosely on the motor shaft or on, an axisl substantially in aline-` ment or cofincident therewith.

Obviously those skilled in the vart may make various changes in thel details and ara direction sheave between the car and motor pulley, a cable connected to the car,

f passing over the direction pulley and fric-y 'between the brakes.

tionally engaging kthe drive pulley, of a brake ,for the drive-(pulley, a brake for the direction pulley, an operative connections 2. In a traction elevator, a motor, a mol tor drivepulley, a car, a cable connected toL the car and extending to the drive pulley,v 'a pulley between said drive pulley and the car, with which the cable engages, a brake for each of said pulleys, means for applying one of the brakes, and opera-ting connections between the brakes. J

3. In a traction elevator, a motor, a motor drive pulley, a car, a cable connected tothe car, arid extending to the drive pulley,;

a pulley between said drive pulley' and the car, with which the cable engages, a brake Y for each of said pulleys, and means operative upon the application of one brake to apply the other rake.

4. In a traction elevator, a motor, a mo` tor drive'pulley, a car, a cable connected to the car and in engagement with the drive pulley, a pulley with which the cable engages between the drive pulley and the'car, a bra-ke for each pulley, and connections between said brakes operative uponthe application of the motor brake to apply the other brake.

5. In a traction elevator, a motor, a motor drive pulley, a car, a cable connected t-o the car and in engagement with the drive pulley,I a pulley with which the cable engages between the drive pulley and the car, a brake pivoted for movement about the axis of the drive pulley, a brake for the other pulley, a movable member connected to the lastnamed brake to operate it, and means connecting said member and the motor brake to operate said member when the motor brake is applied.

6. In a traction elevator, the combination of a motor, a y motor pulley, overhead sheaves, a car, a counterweight, a cable passmg over said sheaves, around the motor pulley andconnected to .the car and counterweight, a brake for the motor pulley, brakes for the `overhead sheaves, and means controlled by'the motor brake for applying the overheadbrakes' when the motorl brake. isl

applied.` I n e l 7. In a traction elevator, kthe combination of a y motor, a motor pulley, overhead 4and means connect-ingthe lever and motor brake to operatevthe lever and apply the overhead brakes when the motor brake is applied. n i

8. The"combination of la plurality of sheaves, a cable engaging said sheaves, 'a

.brake for each sheave, means to apply one of said brakes, and mechanical operating means between` said brake and thev other brake or brakes to apply all ofsaid brakes by power supplied from the firstA brake.

. 9. The combination of a sheave, a brake pivoted concentrically'wi'th the sheave and' having a brake shoe movable into engagement with the sheave, a second sheave, a cable extending between and engaging the sheaves, a lever, a brake shoe connected to Vthe lever in posit-ion to engage said second 4sheave when the lever is operated anda connection between the lever and the'fi'rst fbrake, movable' with said first brake', to operate the 'leverand'apply the, second brake.

10. In an elevator, vthe combination of a motor operable in either direction, a drive a sheave between the car and drive pulley over which said cable passes, a brake for the drive, pulley movable with the ypulley in either direction whenfthe brake is applied, a second brake in position to engage the sheave, a connect-ion between said brakes, operative upon the application of the first ypulley thereon, a car, a cable supporting@ vsaid car and runningon said drive pulley,

brake to apply ythe second brake and limit-u ing the movement of the first brake.

11. The combination of a drive pulley, a brake pivoted for movement about the axis of the drive pulley and having a brake shoe movable into frietional engagement with the pulley, a cable 4in running contact with and operated by said pulley, a brake for f said cable, and operating connections between said `brakes movable to apply the second brake when the first brakelis applied and moved about its axis by the fric'- tional engagement between its shoe and the drive pulley.

' -'a motor drive pulley, an overhead pulley,

. brake at tor shaft.

y th'e brake,

l2. In an elevator, the conejination of a motor, a drive pulley thereon, a brake pivoted on the shaft of the motor and having shoes` positionedl to engage the internal periphery of the drive pullegyafcar, an overhead pulley, a vcable connected t3 the nar, passing over the overhead pulley and in engagement with the drive pulley, a bralxre for the overhead pulley, an operating lever for a flexible connection extending from said lever to the motor brake and connetted thereto at points on opposite sides of the axis of the brake.

18. In any-elevator, the combinationwith a motor operable in either direction, a car,

the car extendinof over said 'pulley andizin frictional engagement with the motor drive pulley, ot' a brake pivoted on the motor shaft, a brakerfor the a cable connected to 'overhead pulley, an operating arm for said' last named brake, a direction pulley, a cable connected to the operating arm and passing about the direction pulle and means connecting said last'named Acable to the motor points on opposite sides of themolet. In .an elevator, the combination of a motor operable in either direction, a motor drive pulley, a car, a counterweighg overhead pulleys, a cable connected at one end to the car, passing over one of the overhead drive. pulley, upward/ around the other pulleys, extending downward around the overhead pulley and connected at its other end to the counterweight, a brake pivoted on `the motor shaft and having Abrake shoes v"l, T M Copies of this patent may be obtained for five cents each, by Washington, 13,0.

l l l 1,043,740 l l b in position to engagethe drive pulley, overhead pulleys ment therewith,

reke. shes, tthe toggle links and tion to apply the brake nectedto the VoperatingI lever, a direction pulley about which the cable extends, and connections 'from the cable to the motor brake at points' "on opposite sides of the motor shaft.

- l5. In an elevator, the combination with a car, a cable, pulleys o 'ver which the cable passes` and means for driving one of said pulleys,\o`f a brake pivoted movable into posishoes, a cable coning a brake shoe movable into frictional en gagement with the pulley to give a turning pull to the brake varying with the pressure o'f'the brake shoe on the pulley, a second brake in operative relation to another'of the pulleys, a member connected to the second brake and movable'into position to apply the brake, and a connection between said member and the first brake for applying the second brake with a power proportional to the power with which the frstbrakeis applied. J

In testimony whereof, I have signed my name to this specification in the presence of two lsubscribing witnesses.

AUGUST SUNDH. Witnesses: i

CHAS. M. Nissan, JAMESG. BETHELL.

addressing the Commissioner of Patents;

the inner periphe.y f bra ke4 shoes between lh? and movable into engage 40 togglel links connectingsai an.A operating' lever connected l or movement about the axis of'one ofthe pulleys and hav- 

